US 51 over Jack Lake Relief
Madison County, Mississippi · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 51 over Jack Lake Relief in Madison County, Mississippi, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1939, making it 86 years old at the 2025 inventory.
- It carries about 930 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 161 of the 311 inventoried bridges in Madison County rated good (51.8%); 10 (3.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (32.84925, -89.96901)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 475 ft |
| Location | 0.1 Mi N SR 17 |
| NBI structure number | 210005104513830 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Mississippi department of transportation.
Busiest bridges in Madison County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 55 over Purple Creek | 1979 | 104,000 | Good |
| I 55 over US 51 & Cnic RR | 1985 | 47,000 | Fair |
| I 55 over US 51 & Cnic RR | 1985 | 47,000 | Fair |
| I 55 over I 220E to I 55 North | 1979 | 47,000 | Fair |
| I 55 over I 220E to I 55 North | 1979 | 47,000 | Fair |
| I 220 over Ditch | 1977 | 47,000 | Good |
All bridges nearby: Madison County, MS bridge conditions · every bridge in Madison County · Mississippi bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.